Fallout 3 Wiki Guide

Sentry Bot

Sentry Bots represent the strongest and most defensively capable of all robotic enemies in the game. They don't have legs, but rather tank-like wheels which allow them to move much more rapidly than their fellow machines. They also have a variety of weapons, including a potent missile launcher that can take out an unsuspecting player in a heartbeat if they don't expect it. The best way to deal with these foes is to do so cautiously. Take cover and fight them patiently. While they're fast and powerful, they don't show an incredible amount of overt aggression. Use this to your advantage to whittle away their health, and don't neglect to search their bodies once felled, since you'll often find a Missile to add to your inventory when you do.